Prior to compiling a 33-47 record as the head coach of the Jets (2006-08) and Browns (2009-10), he was part of three Super Bowl titles with the Patriots under Bill Belichick. Mangini spent five seasons as New England’s defensive backs coach before he was promoted to defensive coordinator in 2005. …

With the 49ers, Sparano will oversee a position group marked by injuries and a lack of production in 2014. Tight end Vernon Davis, 30, a Pro Bowl selection in 2013, had 26 catches for 245 yards and didn’t have a touchdown after collecting two scores in the season opener. Meanwhile, Vance McDonald, a 2013 second-round pick, had just two catches for 30 yards in eight games before landing on injured reserve with a back injury. Tight ends Derek Carrier and Garrett Celek also ended the season injured reserve. …

One of the ex-head coaches who is drawn the 49ers’ interest is Tony Sparano, who has interviewed to be their tight ends coach, ESPN reported Wednesday. Sparano, 53, the Raiders’ interim coach for the final 12 games in 2014, had a 29-32 record with the Dolphins from 2008-11.

In 2014, Mangini oversaw an injured ravaged group in his first season as an offensive position coach. Tight ends Vance McDonald, Garrett Celek and Derek Carrier ended the season on injured reserve, while Vernon Davis dealt with early season injuries and finished with 26 catches, a career-low 245 yards and two touchdowns. …